[INFO] updating cached repository EdenCao/rust_learning
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/EdenCao/rust_learning
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/EdenCao/rust_learning" "work/ex/beta-1.38-1/sources/1.37.0/gh/EdenCao/rust_learning"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/EdenCao/rust_learning'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/EdenCao/rust_learning" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/EdenCao/rust_learning"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/EdenCao/rust_learning'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3b85aa524f292dd7b9939ed7d5de8b6456618f9f
[INFO] sha for GitHub repo EdenCao/rust_learning: 3b85aa524f292dd7b9939ed7d5de8b6456618f9f
[INFO] validating manifest of EdenCao/rust_learning on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of EdenCao/rust_learning on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing EdenCao/rust_learning
[INFO] finished frobbing EdenCao/rust_learning
[INFO] frobbed toml for EdenCao/rust_learning written to work/ex/beta-1.38-1/sources/1.37.0/gh/EdenCao/rust_learning/Cargo.toml
[INFO] started frobbing EdenCao/rust_learning
[INFO] finished frobbing EdenCao/rust_learning
[INFO] frobbed toml for EdenCao/rust_learning written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/EdenCao/rust_learning/Cargo.toml
[INFO] crate EdenCao/rust_learning already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing EdenCao/rust_learning against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/EdenCao/rust_learning:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 567cd7c8475b9b5aebb46c09d09e9b3a5c209dfe4cab872473aca773c64eb413
[INFO] running `"docker" "start" "-a" "567cd7c8475b9b5aebb46c09d09e9b3a5c209dfe4cab872473aca773c64eb413"`
[INFO] [stderr]    Compiling rust_learning v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::time::Duration`
[INFO] [stderr]  --> src/multiple_thread.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::time::Duration;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `refcall`
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider adding a `main` function to `src/refcall.rs`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/enum.rs:20:7
[INFO] [stderr]    |
[INFO] [stderr] 20 |   let six = IpAddrKind::V6;
[INFO] [stderr]    |       ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enum.rs:27:7
[INFO] [stderr]    |
[INFO] [stderr] 27 |   let home = IpAddr {
[INFO] [stderr]    |       ^^^^ help: consider prefixing with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `op_type`
[INFO] [stderr]   --> src/enum.rs:35:10
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn route(op_type: IpAddrKind) { }
[INFO] [stderr]    |          ^^^^^^^ help: consider prefixing with an underscore: `_op_type`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `kind`
[INFO] [stderr]   --> src/enum.rs:14:3
[INFO] [stderr]    |
[INFO] [stderr] 14 |   kind: IpAddrKind,
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `address`
[INFO] [stderr]   --> src/enum.rs:15:3
[INFO] [stderr]    |
[INFO] [stderr] 15 |   address: String
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error: Could not compile `rust_learning`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused variable: `integer`
[INFO] [stderr]   --> src/generics.rs:14:7
[INFO] [stderr]    |
[INFO] [stderr] 14 |   let integer = Point {
[INFO] [stderr]    |       ^^^^^^^ help: consider prefixing with an underscore: `_integer`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `y`
[INFO] [stderr]  --> src/generics.rs:3:3
[INFO] [stderr]   |
[INFO] [stderr] 3 |   y: T
[INFO] [stderr]   |   ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "567cd7c8475b9b5aebb46c09d09e9b3a5c209dfe4cab872473aca773c64eb413"`
[INFO] running `"docker" "rm" "-f" "567cd7c8475b9b5aebb46c09d09e9b3a5c209dfe4cab872473aca773c64eb413"`
[INFO] [stdout] 567cd7c8475b9b5aebb46c09d09e9b3a5c209dfe4cab872473aca773c64eb413